110 lines
2.9 KiB
C++
110 lines
2.9 KiB
C++
#include <asset_parser/assets/text.hpp>
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namespace lt {
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glShader::glShader(
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const Ref<Assets::TextAsset> &vertex_asset,
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const Ref<Assets::TextAsset> &pixel_asset
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)
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: m_shader_id(glCreateProgram())
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{
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auto vertex_blob_metadata = vertex_asset->get_blob_metadata(Assets::BlobMetadata::Tag::text);
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auto pixel_blob_metadata = pixel_asset->get_blob_metadata(Assets::BlobMetadata::Tag::text);
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auto vertex_blob = Assets::Blob(vertex_blob_metadata.uncompressed_size);
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auto pixel_blob = Assets::Blob(pixel_blob_metadata.uncompressed_size);
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vertex_asset->unpack_blob(vertex_blob_metadata.tag, vertex_blob.data(), vertex_blob.size());
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pixel_asset->unpack_blob(pixel_blob_metadata.tag, pixel_blob.data(), pixel_blob.size());
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auto vertex_source = std::string {
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reinterpret_cast<char *>(vertex_blob.data()),
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reinterpret_cast<char *>(vertex_blob.data()) + vertex_blob.size(), // NOLINT
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};
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auto pixel_source = std::string {
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reinterpret_cast<char *>(pixel_blob.data()),
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reinterpret_cast<char *>(pixel_blob.data()) + pixel_blob.size(), // NOLINT
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};
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const auto vertex_shader = compile_shader(vertex_source, Shader::Stage::vertex);
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const auto pixel_shader = compile_shader(pixel_source, Shader::Stage::pixel);
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glAttachShader(m_shader_id, vertex_shader);
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glAttachShader(m_shader_id, pixel_shader);
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glLinkProgram(m_shader_id);
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glDeleteShader(vertex_shader);
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glDeleteShader(pixel_shader);
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}
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glShader::~glShader()
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{
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glDeleteProgram(m_shader_id);
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}
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void glShader::bind()
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{
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glUseProgram(m_shader_id);
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}
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void glShader::un_bind()
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{
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glUseProgram({});
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}
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auto glShader::compile_shader(const std::string &source, Shader::Stage stage) -> unsigned int
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{
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// &(address of) needs an lvalue
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const auto *lvalue_source = source.c_str();
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auto shader = glCreateShader(
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stage == Shader::Stage::vertex ? GL_VERTEX_SHADER :
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stage == Shader::Stage::pixel ? GL_FRAGMENT_SHADER :
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stage == Shader::Stage::geometry ? GL_GEOMETRY_SHADER :
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0
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);
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// compile
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glShaderSource(shader, 1, &lvalue_source, nullptr);
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glCompileShader(shader);
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// check
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auto isCompiled = 0;
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glGetShaderiv(shader, GL_COMPILE_STATUS, &isCompiled);
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if (isCompiled == GL_FALSE)
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{
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auto logLength = 0;
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glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLength);
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auto *errorLog = (char *)alloca(logLength);
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glGetShaderInfoLog(shader, logLength, &logLength, &errorLog[0]);
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log_err(
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"glShader::glShader: failed to compile {} shader:\n {}",
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stage == Shader::Stage::vertex ? "Vertex" : "Pixel",
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errorLog
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);
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return {};
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}
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#define LIGHT_OPENGL_ENABLE_SHADER_INFO_LOG
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#ifdef LIGHT_OPENGL_ENABLE_SHADER_INFO_LOG
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// info log
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{
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auto logLength = 0;
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glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLength);
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if (logLength)
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{
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char *infoLog = (char *)alloca(logLength);
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glGetShaderInfoLog(shader, logLength, &logLength, &infoLog[0]);
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log_wrn("Shader info: {}", infoLog);
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}
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}
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#endif
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return shader;
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}
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} // namespace lt
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